用艾奇逊炉在不同温度提纯碳纳米管

摘要/Abstract

摘要： 利用艾奇逊炉分别在3 000 ℃和2 800 ℃下进行碳纳米管的提纯实验。利用ICP、EDS、TGA检测了提纯碳纳米管的主要催化金属含量、灼烧残余物含量;用四探针薄膜电阻仪检测其电阻率;利用SEM、XRD、FT-IR研究了不同温度提纯碳纳米管的组织结构变化和表面特点。研究结果表明,艾奇逊炉在不同温度下提纯的碳纳米管都可以有效降低碳纳米管粉体中的催化金属含量和灼烧残余物含量,满足动力电池导电剂要求。与原生碳纳米管比较,3 000 ℃提纯的碳纳米管的电阻率显著下降,石墨晶化程度提高;而2 800 ℃提纯的碳纳米管的电阻率略有提高,石墨晶化程度变化不大,表面官能团数量减少。

关键词: 碳纳米管, 高温纯化, 艾奇逊炉, 体积电阻率, 石墨晶化

Abstract: Carbon nanotubes, as a successful conducting agent for power lithium ion cathode, have been applied in a large scale. Among the production of carbon nanotubes, the purification of carbon nanotubes is an important step for the application in lithium ion power battery. In this paper, physical purification, instead of chemical purification, of as-carbon nanotube soot in an Acheson furnace was investigated. The carbon nanotubes were first purified in an Acheson furnace at 3 000 ℃ and 2 800 ℃ respectively. Then, metal content, burning residue content of these purified carbon nanotubes were measured with ICP, EDS, and thermos-gravimetric analysis (TGA). And their resistivity were detected with a four-probe film resistance instrument. The micro structure and surface characteristics of these carbon nanotubes purified at different temperatures were characterized by SEM, XRD, FT-IR. The results show that the carbon nanotubes purified respectively at different high temperatures in Acheson furnace can be effectively reduced in metal content and burning residues, and these carbon nanotubes, as conductive agent can meet the requirements of power battery. Compared with the non-purified carbon nanotubes, the resistivity of carbon nanotubes purified at 3 000 ℃ decreases significantly and the crystallization degree of graphite increases, while the resistivity of carbon nanotubes purified at 2 800 ℃ increases slightly, the degree of graphite crystallization did not change much, and the quantity of their surface functional groups decreases.

Key words: carbon nanotube, high temperature purifying, Acheson furnace, volume resistivity, crystallization of graphite

中图分类号:

陈隆波, 王月雷, 钟良伟, 郭纪林, 曾志鹏, 曾效舒. 用艾奇逊炉在不同温度提纯碳纳米管[J]. 人工晶体学报, 2022, 51(11): 1911-1920.

CHEN Longbo, WANG Yuelei, ZHONG Liangwei, GUO Jilin, ZENG Zhipeng, ZENG Xiaoshu. Purifying Carbon Nanotubes at Different Temperatures by Acheson Furnace[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(11): 1911-1920.

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